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@ 2014-01-02T15:02:39Z

<?php
$test = 'test';
$arr = ['test','test2', 'test3', 'test4'];
$found = [];
if(false !== $key = !array_search($test, $arr)){
    $found[] = $key;
}
print_r($found);

Output
Performance
VLD
References
Branches

array_search: documentation ( source)
print_r: documentation ( source)

preferences:dark modelive preview

44.04 ms | 402 KiB | 5 Q